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  1.  
  2. #include <stdio.h>
  3. size_t s_length(const char* s);
  4. void   s_copy(char* d, const char* s, size_t n);
  5. void   s_move(char* d, const char* s, size_t n);
  6.  
  7.  
  8. char* s_replace(char* s, const char* old, 
  9. 	            const char* ns, size_t maxsize){
  10. 	const char* p2;
  11. 	size_t n1, n2, n3, i;
  12. 	char*  p1, *t = s;
  13.  
  14. 	n1 = s_length(old);
  15. 	n2 = s_length(ns) + 1;
  16. 	n3 = s_length(s) + 1;
  17. 	i  = 0;
  18.  
  19. 	while(*s && (i < 9)){
  20. 		p1 = s;
  21. 		p2 = old;
  22. 		while(*p2 && (*p2 == *p1)){
  23. 			++p1;
  24. 			++p2;
  25. 		}
  26.  
  27. 		if(! *p2){
  28. 			if(n2 > n1){
  29.  
  30. 				//защита от переполнение выходного буфера
  31. 				if((n3 + (n2 - n1)) >= maxsize)
  32. 					break;
  33.  
  34. 				s_move(s + (n2 - n1), s, n3 - (size_t)(s - t));
  35. 				n3 += n2 - n1;
  36. 			} else {
  37. 				s_copy(s, s + (n1 - n2), n3 - (size_t)(s - t));
  38. 				n3 -= n1 - n2;
  39. 			}
  40.  
  41. 			s_copy(s, ns, n2);
  42. 			s   += n2 - 1;
  43. 			*s++ = (char)(i + '1');
  44. 			++i;
  45. 			continue;
  46. 		}
  47. 		++s;
  48. 	}
  49. 	return t;
  50. }
  51.  
  52.  
  53. int main(void){
  54. 	char s[64] = "ПОЛИЛИ_ЛИЛИЮ";
  55. 	puts(s);
  56. 	puts(s_replace(s, "ЛИ", "СТО", sizeof(s) - 1));
  57. 	return 0;
  58. }
  59.  
  60.  
  61. size_t s_length(const char* s){
  62. 	const char* t = s;
  63. 	while(*s)
  64. 		++s;
  65. 	return (size_t)(s - t);
  66. }
  67.  
  68. void s_copy(char* d, const char* s, size_t n){
  69. 	size_t i;
  70. 	for(i = 0; i < n; ++i)
  71. 		*d++ = *s++;
  72. }
  73.  
  74. void s_move(char* d, const char* s, size_t n){
  75. 	size_t i;
  76. 	d += (n - 1);
  77. 	s += (n - 1);
  78. 	for(i = n; i > 0; --i)
  79. 		*d-- = *s--;
  80. }
  81.  
Success #stdin #stdout 0s 2052KB
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ПОЛИЛИ_ЛИЛИЮ
ПОСТО1СТО2_СТО3СТО4Ю
https://ideone.com/Rr1S5h
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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